/*
 * libjingle
 * Copyright 2013, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.infthink.demo.webrtc;

import android.content.Context;
import android.media.AudioManager;
import android.util.Log;

/**
 * AppRTCAudioManager manages all audio related parts of the AppRTC demo.
 * TODO(henrika): add support for device enumeration, device selection etc.
 */
public class AppRTCAudioManager {
    private static final String TAG = "AppRTCAudioManager";

    private boolean initialized = false;
    private AudioManager audioManager;
    private int savedAudioMode = AudioManager.MODE_INVALID;
    private boolean savedIsSpeakerPhoneOn = false;
    private boolean savedIsMicrophoneMute = false;

    /** Construction */
    static AppRTCAudioManager create(Context context) {
        return new AppRTCAudioManager(context);
    }

    private AppRTCAudioManager(Context context) {
        Log.d(TAG, "AppRTCAudioManager");
        audioManager = ((AudioManager) context
                .getSystemService(Context.AUDIO_SERVICE));
    }

    public void init() {
        Log.d(TAG, "init");
        if (initialized) {
            return;
        }

        // Store current audio state so we can restore it when close() is
        // called.
        savedAudioMode = audioManager.getMode();
        savedIsSpeakerPhoneOn = audioManager.isSpeakerphoneOn();
        savedIsMicrophoneMute = audioManager.isMicrophoneMute();

        // The AppRTC demo shall always run in COMMUNICATION mode since it will
        // result in best possible "VoIP settings", like audio routing, volume
        // control etc.
        audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);

        initialized = true;
    }

    public void close() {
        Log.d(TAG, "close");
        if (!initialized) {
            return;
        }

        // Restore previously stored audio states.
        setSpeakerphoneOn(savedIsSpeakerPhoneOn);
        setMicrophoneMute(savedIsMicrophoneMute);
        audioManager.setMode(savedAudioMode);

        initialized = false;
    }

    /** Sets the speaker phone mode. */
    private void setSpeakerphoneOn(boolean on) {
        boolean wasOn = audioManager.isSpeakerphoneOn();
        if (wasOn == on) {
            return;
        }
        audioManager.setSpeakerphoneOn(on);
    }

    /** Sets the microphone mute state. */
    private void setMicrophoneMute(boolean on) {
        boolean wasMuted = audioManager.isMicrophoneMute();
        if (wasMuted == on) {
            return;
        }
        audioManager.setMicrophoneMute(on);
    }
}
